SGLang Cross-Hardware Replay Evidence

Initial evidence packet for H200 repeatability and H200/H100 NVL held-out replay comparisons.

• README.md
• comparisons/combined_summary.json
• comparisons/h200_repeatability_heldout_summary.json
• comparisons/h200_repeat_vs_h100nvl_heldout_summary.json
• gpu_shutdown/SHA256SUMS.txt
• meta/manifest.json
• SHA256SUMS.txt